Pick the answer from the following options that best explains the concept of "inertia."

The tendency of an object at rest to remain at rest


Inertia is the tendency of an object to remain at rest unless sufficient force is put upon it to move the object. The other choices are nonsensical. Objects in motion don't gain speed unless additional force is applied. Matter sometimes disintegrates but that has nothing to do with inertia. Choice "2" is a wrong choice because objects in motion tend to keep moving in the same direction unless a directional force is applied.

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